X Factor finalists light No10 Christmas tree

Prime Minister David Cameron was joined by the three X Factor finalists and judge Nicole Scherzinger in Downing Street for the switching on of No 10 s Christmas tree lights. X Factor contestants Jahmene Douglas, James Arthur and Christopher Maloney, along with judge Nicole Scherzinger, helped David Cameron switch on Downing Street s festive illuminations. The singers then performed Christmas carols on the steps of No 10 for dozens of cheering schoolchildren. The winner of the ITV talen